This paper presented the methods developed for the minimisation of the generator power to be installed on a future all-electric aircraft. Minimising the installed generator power is a means to save weight on the generators, converters, feeder wires, busbars, contactors and the other miscellaneous equipment of the electric power supply system. The generator power is minimised by optimising the allocation of the electrical consumers to the generators, in combination with an intermittent power decrease or shutdown of some nonessential consumers, e.g. the environmental control system and the galleys. The generators are sized for the maximum steady-state power demands, which are determined from the generator power profiles by a continuous average filtering technique. Advantage is taken of the generator overload capability for the coverage of short peak demands. A Virtual Iron Bird (VIB) is configured as a modelling, simulation and analysis tool to evaluate the power behaviour of entire aircraft system configurations. The VIB model library is based on the object-oriented and multi-physical modelling tool Modelica. This tool supports a flexible assembly and alteration of complex aircraft architecture models, and also the simulation of all aircraft systems using different forms of power in one comprehensive model. The complexity of the task of minimising the generator design power is demonstrated by a manually executed optimisation. The process is centred to an engineering evaluation, which includes a rating of the steady-state and peak generator power that are computed by simulations of VIB aircraft system models, and a modification of the tuners by hand in consideration of the redundancy constraints. Moreover, an automated optimisation procedure is developed. The intention is to overcome the limitations of the manually executed process, which may become time-consuming or even unmanageable when the number of tuners, criteria, constraints or architecture variants is increased. This procedure draws upon an automatic optimisation algorithm, which performs an evaluation of the criteria and a modification of the tuners in lieu of the engineer. The design rules, i.e. the criteria and constraints, have to be mathematically formulated, so that the optimisation algorithm can automatically find practicable solutions. This automated approach is supported by the Matlab-based optimisation tool Multi-Objective Parameter Synthesis (MOPS). The interface of this tool with the Modelica-based VIB thus enables a complete integration of the automatic optimisation process. This demonstrates the potentials of integrated modelling, simulation and optimisation tools for future aircraft systems design.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Generator power optimisation for a more-electric aircraft by use of a Virtual Iron Bird


    Weitere Titelangaben:

    Optimierung der Generatorleistung für ein vorwiegend elektrisch betätigtes Flugzeug mit Hilfe eines Virtuellen Eisernen Vogels


    Beteiligte:
    Schallert, C. (Autor:in) / Pfeiffer, A. (Autor:in) / Bals, J. (Autor:in)


    Erscheinungsdatum :

    2006


    Format / Umfang :

    10 Seiten, 13 Bilder, 5 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch